Fastening device



FIG. 1 is a rear, top, right side view of a fastening device;

FIG. 2 is a front, bottom, left side perspective view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a left side view thereof, the right side being a mirror image of. 

CLAIM The ornamental design for a fastening device, as shown and described. 